MOD E02: Unix Internals

Question 1

A system call is the fundamental interface between an application and the Linux kernel.

[TRUE /FALSE]

Answer 1

TRUE

Question 2

What command can be utilized to intercept and record system calls?

Answer 2

strace

Question 3

Within the following command (strace -____ test1.log ls filedir/), what option can be listed to output the contents strace reveals?

Answer 3

o

Question 4

System Libraries are located where?

• User processes
• Hardware
• Kernel
• User Space

Answer 4

User Space

Question 5

What were created to allow users to add code to the Linux Kernel while it is running?

• Syscall
• LKM
• PID
• PPID

Answer 5

LKM

(Loadable Kernel Modules)

Question 6

What command can be used to show the status of currently loaded LKM’s?

Answer 6

lsmod

Question 7

LKMs only have to be loaded when you’re actually using them. [TRUE / FALSE]

Answer 7

TRUE

Question 8

What command will display a snapshot of the current system processes?

Answer 8

ps

Question 9

What command can display active processes continuously, until prompt to stop?

Answer 9

top

Question 10

What is the process call when it is still running after the GUI or application is closed?

• Process
• Zombie
• Parent Process
• Top

Answer 10

Zombie

Question 11

The login shell is set at the time of account creation.

[TRUE / FALSE]

Answer 11

TRUE

Question 12

The login shell is set at the time of account creation.

[TRUE / FALSE]

Answer 12

TRUE

Question 13

In order to see what login shell the user is currently operating in, what command do you use?

• echo $pwd
• echo $0
• chsh
• echo shell

Answer 13

echo $0

Question 14

The login shell is the second process that is executed with your user ID when you log into an interactive session.

[TRUE / FALSE]

Answer 14

FALSE

Question 15

Login shells read environment variables from where?

• -/bin/profile
• -/var/profile
• /etc/profile
• /tmp/profile

Answer 15

/etc/profile

Question 16

To view what type of shell the user is currently operating in, what command do you use?

• echo Spwd
• echo $0
• chsh
• echo $SHELL

Answer 16

echo $0

Question 17

What command is used to change shells?

Answer 17

chsh

Question 18

What is a Linux based text editor that allows for updates and changes in the terminal window?

• Text editor
• nano
• wordpad
• notepad

Answer 18

nano

Question 19

What contains the user’s specific environment and start up programs?

• desktop
• documents
• profile
• tmp

Answer 19

profile

Question 20

With a restricted shell, a user cannot use the change directory command (cd).

[TRUE / FALSE]

Answer 20

TRUE

Question 21

What command, learned in the lesson, can be used to invoke a bash restricted shell?

Answer 21

bash -r

Question 22

What command can be used to locate where the rbash executable file is located?

Answer 22

whereis rbash

Question 23

Which of the following is not a feature of Local variable:

• only accessed in the shell in which they were created.
• They are not transferred to a new shell when the variable is created
• Variable that is set across user accounts
• An example is history

Answer 23

Variable that is set across user accounts

Question 24

What command is used to view the environment variables?

Answer 24

printenv

Question 25

What is known as an encrypted channel for data exchange?

Answer 25

SSH

(Secure Shell)

Question 26

What command can be used to securely copy a file?

Answer 26

SCP

(secure copy)

Question 27

What scp option can be used to specify a port?

• -p
• -v
• -r
• -P

Answer 27

-P

(capitalized)

Question 28

What is a standard network protocol used to transfer files to and from a remote network?

Answer 28

SFTP

(Secure File Transfer Protocol)